What could be causing the ERROR TypeError in an Angular form where "_co.service.formData" is undefined?

My attempt to create a form in Angular 7 has resulted in an error message: ERROR TypeError: "_co.service.formData is undefined"

Here is the HTML code for the component:

<form (sumbit)="signUp(form)" autocomplete="off" #form="ngForm">
  <div class="form-group">
     <input name="Name" class="form-control" #Name="ngModel"  [(ngModel)]="service.formData.Name"  required>
  </div>
</form>

This is the TypeScript code snippet:

import { Component, OnInit } from '@angular/core';
import {UserService} from '../../shared/user.service';
import {NgForm} from '@angular/forms';
@Component({
  selector: 'app-agent-signup',
  templateUrl: './agent-signup.component.html',
  styleUrls: ['./agent-signup.component.css']
})
export class AgentSignupComponent implements OnInit {

  constructor(private service:UserService) { }

  ngOnInit() {
  }
  signUp(form:NgForm)
  {

  }
}

Below is the user.service code:

import { Injectable } from '@angular/core';
import {UserData} from './user.model';
import {HttpClient} from '@angular/common/http';
import {environment} from '../../environments/environment';
 const API_URL=environment.apiUrl;
@Injectable({
  providedIn: 'root'
})
export class UserService {
  formData : UserData;
  constructor(private http:HttpClient) {}

  createUser(formData:UserData)
  {
     return this.http.post(API_URL+'/user/signup',formData);
  }
}

Lastly, here is the user.model class:

export class UserData{

  public Email:string;
  public Password:string;
  public  Rera_no:string;
  public Name:string;
  public Company_name:string;
}

After running into the error "ERROR TypeError: "_co.service.formData is undefined", I'm puzzled. Any guidance on where I might be wrong and how to rectify it would be appreciated.

Answer №1

When initializing with the Class object, make sure to also create its object within your component.

Change this:

formData : UserData;

To this:

formData = new UserData();

Update your template accordingly:

<form (submit)="signUp(form)" autocomplete="off" #form="ngForm">
  <div class="form-group">
     <input name="Name" class="form-control" #Name="ngModel"  [(ngModel)]="service.formData?.Name"  required>
  </div>
</form>

This should fix the issue you are experiencing.

EDIT:

If you are using an Object variable as ngModel which is not yet created in the Service, initialize it first with an empty string.

export class UserData{

  public Email:string;
  public Password:string;
  public  Rera_no:string;
  public Name: string = '';
  public Company_name:string;
}

Answer №2

Make sure to call the method from the UserService service within the AgentSignupComponent component. You should invoke the createUser method in the component's code.

import { Component, OnInit } from '@angular/core';
import {UserService} from '../../shared/user.service';
import {NgForm} from '@angular/forms';
@Component({
  selector: 'app-agent-signup',
  templateUrl: './agent-signup.component.html',
  styleUrls: ['./agent-signup.component.css']
})
export class AgentSignupComponent implements OnInit {

  constructor(private service:UserService) { } //Remember to actually call this method after injecting UserService;

  ngOnInit() {
  }
  signUp(form:NgForm) {
    this.service.createUser(form); 
  }
}

Answer №3

To discover the properties accessible in your console, insert console.log(service); within the InOnInit() method of your AgentSignupComponent class. The issue arises when the UserData object within your formData variable cannot be accessed. To rectify this, create a new instance of UserData and assign a value to the variable. Modify formData : UserData; to formData = new UserData();

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